Dynamo-electric generator.



No. 633,857. Patented Sept. 26, I899.

B. G. LAMME.

DYNAMO ELECTRIC GENERATDR.

(Application filed Apr. 14, 1899.)

2 Sheets-Sheet (No Model.)

No. 633,857. Patented Sept. 26, I899.

B. a. LAMME.

DYNAMO ELECTRIC GENERATOR.

(Application filed Apr. 14, 1899.)

2 Sheets-Sheet 2,

/ INVENTOH W2- ATTORNEY.

72MW/TNESSES QQ LW $290M UNITED STATES PATENT OEErcE,

BENJAMIN G. LAMME, OF PIT SBURG, PENNSYLVANIA, ASSIGNOR TO THE W'ESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, OF PEN)? SYLVANIA.

DYNAMO-ELECTRIC GENERATOR.

SPECIFICATION forming part of Letters Patent No. 638,857, dated September 26, 1899.

Application filed April 14,1899- Serial No. 718,013. (No model.)

'10 all whom it may concern nated core i?,this core being built up of toothed Be it known that I, BENJAMIN G. LAMME, a overlapping plates, each of which is provided citizen of the United States, residing at Pittswith a plurality of dovetail projections which burg, in the county of Allegheny and State of fit into corresponding dovetail recesses or 5 Pennsylvania, have invented a new and usegrooves in the inner periphery of the frame, 'l'ul Improvement in Dynamo-Electric Generas is usual in machines of this general class. ators, (Case No. 822,) of which the following The laminae constituting the core 2 are sepis a specification. arated into annular groups or segments by lllyinventionrelates to dynamo-electricmameans of spacing-plates 3, which have sub- 1o chines; and it has for its objectto provide a stantially the same general form as t-helamina:

machine of this character which shall be comconstituting the core proper, but having latparatively inexpensive in construction and eral ribs, so as to space apart the adjacent the several parts of which shall be so 0011- core-laminzcand thus provide ventilating-passtructed and arranged as toinsure proper vensages for thepurpose of keeping the tempera- .15 tilation of both the stationary and rotating ture of the core within safe working limits. members, insure the retention of the several The coils which are iitted into the slots in the parts in proper relative position, provide wellcore 2 are not shown, but maybe constructed balanced and effective magnetic circuits, and and arranged as is usual in machines of this minimize the amount of copper necessary for general type, so as to supplyto the external 20 a given output of energy. circuit orcircuits currents of one, two, or more In the accompanying drawings, Figure l is phases, as may be desired. a view, partiallyin end elevation andpartially Mounted concentrically with the frame 1 in section, of a generator constructed in acand core in suitable bearings (not shown) is cordance with my invention, the armaturea shaft 4, on which is keyed a spider 5, the

25 coils and some of the field-magnet coils being rim and arms of which maybe provided with omitted. Fig. 2 is a sectional detail view of dovetail grooves. Mounted upon this spider a portion of the field-magnet and armature of is the field-magnet core (3, which is built up of a machine constructed in accordance with my overlapping segmental lamina: or plates, each invention, the structure being substantially plate having a body portion provided with 30 the same as that shown in Fig. 1, although of dovetail projections to ii t into the dovetail slightly-modified construction as regards cergrooves or recesses in the spider and with tain details. Fig. Sis a radial sectional view radial pole-piece projections (5, there being of the portion of the machine shown in Fig. two or more of these projections to each 2. Fig. 4; is a detail view of a portion of two plate. The sides of each pole-piece projec 35 field-magnet pole-pieces and a cooperating tion may be parallel, as shown, or the con.-

coil-retaining wedge. Fig. 5 is a plan view of fronting sidesof adjacent projections may be thepartshownin Fig. 4-, the ends of thewedge parallel, or the shape of these projections and of the corresponding portions of the polemay be otherwise varied to suit the desires pieces being broken away. Fig. 6 is a view of the designer or manufacturer. This field 40 corresponding to Fig. at, but showing a modimagnet core 4'; is divided into a plurality of fication. Fig. 7 is a detail end view of a field annular groups or segments by means of magnet pole-piece of modified construction. ribbed spacing-plates 7, supported in. the Referring now to the details of construction same manner as are the core-plates proper, illustrated in the drawings, 1 is the armatureand the whole core structure is clamped to- 5 45 frame of the machine, which is preferably of gethcr by means of heavy end plates 8 and skeleton open-work construction in order to bolts 9, which extend through the end plates, secure ventilation, economize material, and the core-lamina, and spacing-plates. The make the structure as light as is consistent ventilating-spaces through the field-magnet with proper strength. This frame is supcore are prefcrabl y arranged in substantially 5'0 ported upon a suitable bed-plate or base (not i the same planes as the ventilating-spaces in shown) and. is provided with an annularlamil the armature-core, so that as the field-magnot is rotated it will act as a blower to force the air through the openings in the spider, the spaces in its core, the spaces in the armature-core, and the openings in the armatureframe.

upon all of the field-magnet pole-pieces or only alternately, as may be desired. shown each pole-piece as provided with a tially filling the spaces between the polepieces; but my invention is not limited to any specific number or arrangement of coils.

my present invention have nntnyadvantages over those of the rotary-field type as heretofore constructed. For example, the fieldmagnet core built up of overlapping plates and bolted together, as shown and described, The field-magnet coils 10 may be placed I have i constitutes a laminated fly-wheel of great strength and permanence of structure. The magnetic circuits are substantially confined j to the laminated structure and are therefore field-magnet coil, the several coils substau- In order to retain the coils 10 in position, I

provide each pole piece with side grooves 11 near its outer end, and after the coils are in position I insert between each two adjacent pole-pieces a metal wedge 12, the edges of which are located in the side grooves, in which they make a sufficiently close fit so that the coils and supporting-wedges will be firmly held in operative position. In Figs. 2, t, and 5 I have shown wedges 12, made in two parts, each part having at its inner end a transverse flange 12, so that the two parts may be driven into place from the opposite ends of the core and the flanges then bolted together.

ducting metal, such as copper or brass, and with the construction here shown they will not only serve to hold the coil securely in position, but will constitute closed secondary circuits adjacent to the pole-tips, and thus tend to equalize the magnetic circuits of the Ipre- I fer to make these wedges of some good conuniform, and the fluxes are not obstructed or interfered with by defects orjoints in the castmetal spider. The coils are substantially surrounded on four sides by metal-i. 0., by the core proper and the retaining-wedgesso that the heat generated in the coils is readily l l t Since these parts are so formed as to have a wedging action,it isimpossible for 1 l i l l machine by destroying the distorting effect due to armature reaction at the pole-tips.

12 is substantially the same in construction transferred to the surrounding metal by conduction and is there dissipated by reason of the ventilating openings and passages. The heat generated in the field-magnet coils is thus more effectively dissipated than has heretofore been possible, since it is transferred by conduction at a more rapid rate than is possible by convection alone. It has been found in practice that by employing the construction shown and described the amount of copper necessary for a given output of energy is Very much less than in machines of prior construction.

lVhile I have illustrated and described my invention as embodied in a machine having a rotary field-magnet, I desire it to be understood that some of the advantages specified may be obtained by embodying the invention in machines having stationary field-magnets. I therefore do not intend to limit my invention in this respect or in other respects to the exact details shown and described.

I claim as my invention-- 1. In a dynamo-electric generator, a rotary, laminated field-magnet core having radial pole-pieces provided with coils and with side grooves adjacent to the outer ends of the coils, metal coil-retaining wedges or plates held in position by projections located in said grooves .5 and projecting over the edges or tips of the In Fig. 6 the two-part coil-retaining wedge and function as that shown in Figs. el and 5 1 ject'that is, they not only serve to clamp the laminae of the core securelytogether between the end plates, but theyalso serve, in conj unc tion with the end plates, as closed secondaries,

- and thus cooperate with the flanged wedges to destroy the injurious effects of armature reaction, and thus equalize the magnetic circuits of the machine.

Machines constructed in accordance with pole-pieces.

2. In a dynamo-electric generator, a fieldmagnet core comprising a plurality of annular laminated segments separated by ventilatingspaces, the outer ends of the pole-pieces of said core being joined by metal coil-retaining wedges that extend over the edges or tips of the pole-pieces.

In a dynamo-electric machine, the combin-ation with a stationary frame having a laminated core separated by spacing-plates into near its outer end, these bolts being employed i in this relation in order to serve a double oba plurality of annular segments, of a spider provided with a laminated core separated by spacing-plates into a plurality of annular segments, the pole-pieces of said core having side grooves near their outer ends, and wedges cooperating with said grooves to retain the holdmagnet coils in position.

1-. In a dynamo-electric machine, a laminated field-magnet core having radial polepieces for the field-magnet coils and two-part metal wedges located between the pole-pieces adjacent to the outer ends of the coils for retaining the latter in position.

5. In a dynamo-electric machine, a laminated, rotary field-magnet core having radial pole-pieces provided With side grooves near their outer ends, end plates and bolts for fastening the core-laminae together, and ooil rciaining Wedges cooperating with said groores and extending over the pole tips or edges.

6. In a dynamo-electric machine, a laminated field-magnet core having radial pole- 

